/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.spring.cloud;

import org.apache.camel.cloud.ServiceDefinition;
import org.apache.camel.cloud.ServiceLoadBalancer;
import org.apache.camel.cloud.ServiceLoadBalancerFunction;
import org.apache.camel.impl.cloud.DefaultServiceDefinition;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;

public class DefaultServiceLoadBalancer implements ServiceLoadBalancer {
    private final LoadBalancerClient client;

    public DefaultServiceLoadBalancer(LoadBalancerClient client) {
        this.client = client;
    }

    @Override
    public <T> T process(String serviceName, ServiceLoadBalancerFunction<T> function) throws Exception {
        return client.execute(serviceName, instance -> {
            return function.apply(
                convertServiceInstanceToServiceDefinition(instance)
            );
        });
    }

    protected ServiceDefinition convertServiceInstanceToServiceDefinition(ServiceInstance instance) {
        return new DefaultServiceDefinition(
            instance.getServiceId(),
            instance.getHost(),
            instance.getPort(),
            instance.getMetadata()
        );
    }
}
